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  #1  
17th April 2015, 10:16 AM
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X25 dte dce

hi I have heard about the x25 DTE DCE in terms of communication. Can you please tell me exactly about the x25 DTE DCE like what is it and how it was related from the communication. Provide me some information related to this so that I get to know about the x25 DTE DCE?
  #2  
10th August 2018, 09:55 AM
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Re: X25 dte dce

Hello sir, Im looking for notes for X25 DTE DCE. is there any one can provide me here notes for X25 DTE DCE?
  #3  
10th August 2018, 09:57 AM
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Join Date: Aug 2012
Re: X25 dte dce

The X25 DTE DCE is a first packet switching interface. The X25 DTE DCE is issued in 1976 and revised in 1980, 1984, 1988, and 1992.

X.25 is an ITU-T standard protocol suite for packet switched wide area network (WAN) communication.

An X.25 WAN consists of packet-switching exchange nodes as the networking hardware, and leased lines, plain old telephone service connections, or ISDN connections as physical links.

The Data Terminal Equipment (DTE) to Data Communication Equipment (DCE) interface p User to network interface (UNI)

Used universally for interfacing to packet switched networks

X.25 facilities:


Essential facilities;
Additional facilities;
Conditional facilities;
Mandatory facilities; and,
Optional facilities.
Subscription only;
Subscription followed by dynamic invocation;
Subscription or dynamic invocation; and,
Dynamic invocation only.

Virtual circuit service:


Virtual call= Switched virtual circuit (SVC)
Permanent virtual circuit (PVC)
X.25 Packets
Data is broken into blocks
3- or 4-byte header

VC Assignment (Cont):


Lowest incoming channel (LIC)
Highest incoming channel (HIC)
Lowest two way channel (LTC)
Highest two way channel (HTC)
Lowest outgoing channel (LOC)
Highest outgoing channel (HOC)
Virtual Circuit Number = Logical Group # and Logical Channel #

For more details here i am giving link of Notes by Jain sir for X25 DTE DCE
cse.wustl.edu/~jain/cis777-98/ftp/g_4x25.pdf


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